Garbage incinerator

Abstract

A garbage incinerator comprises a combustion grate, a passage for feeding garbage to be combusted onto the grate, a combustion chamber above the grate, and a flue communicating with the combustion chamber and projecting upwardly therefrom. A nozzle box supplied by a separate blower with compressed air is arranged in the region of the flue and provided with a plurality of nozzles oriented to direct air streams at high speed in at least two directions transverse to each other into the stream of flue gas passing through the flue. Preferably, some of the nozzles are oriented to direct air streams substantially parallel to the wall of the flue, whereas other nozzles are oriented to provide air streams which extend transverse to the direction of the first-mentioned air streams.

What is claimed as new and desired to be protected by Letters Patent is set forth in the appended claims: 
     
       1. In a garbage incinerator, comprising a combustion grate, inlet passage means for feeding garbage onto said combustion grate, wall means forming a combustion chamber above said grate and an upwardly projecting flue connected to said combustion chamber so that a stream of flue gases passes from said combustion chamber through said flue; the improvement comprising nozzle box means for blowing secondary air streams at high speed into said stream of flue gas, said wall means further including a transition zone between said combustion chamber and said flue, said nozzle box means being positioned within said wall means and in said transition zone, said nozzle box means being provided with blower means for supplying secondary air into said nozzle box means, said nozzle box means extending horizontally over the entire width of said combustion chamber and including a plurality of nozzles distributed over the entire length of said nozzle box means and being closely arranged relative to each other, at least some of said nozzles having axes being oriented to direct air streams at high speed, in a direction transverse to the stream of flue gases. 
     
     
       2. The incinerator as defined in claim 1, wherein said nozzle box means includes at least one side formed with said nozzles, said nozzles being arranged on said side in two rows, the nozzles in said two rows being offset relative to each other so that the distance between adjacent nozzles in each row is at most equal to the diameter of each nozzle. 
     
     
       3. A garbage incinerator as defined in claim 1, wherein said nozzle box means has a first plurality of nozzles oriented to direct air streams at high speed in a direction transverse to the stream of flue gas and a second plurality of nozzles to direct air streams at high speed in a direction substantially parallel to the wall means forming said flue. 
     
     
       4. A garbage incinerator as defined in claim 1, wherein said wall means form at the transition zone between said combustion chamber and said flue at least one nose-like protrusion having an upwardly inclined face, and wherein said nozzle box means is arranged adjacent to said protrusion and having a first plurality of nozzles oriented to direct air streams at high speed in upward direction along said upwardly inclined face and a second plurality of nozzles oriented to direct air streams at high speed in a direction transverse to said first mentioned streams into said stream of flue gas. 
     
     
       5. A garbage incinerator as defined in claim 1, wherein said wall means form at the transition zone between said combustion chamber and said flue a nose-like protrusion having an upwardly inclined face, and wherein said nozzle box means is arranged above and adjacent to said inclined face and having a first plurality of nozzles oriented to blow air streams at high speed in downward direction substantially parallel to said inclined face and a second plurality of nozzles oriented to blow air streams at high speed in a direction transverse to said first-mentioned air streams into said stream of flue gas. 
     
     
       6. A garbage incinerator as defined in claim 1, wherein nozzle box means is annular and is positioned substantially in a plane normal to said upwardly extending flue, said nozzle box means having a first plurality of nozzles oriented for directing air streams at high speed substantially parallel to the upwardly extending wall of said flue and a second plurality of nozzles oriented to direct air streams at high speed transverse to the first-mentioned air streams into said stream of flue gas. 
     
     
       7. A garbage incinerator as defined in claim 6, wherein said nozzle box means has a trapezoidal cross-section and a lower wall substantially normal to said flue and an inner wall extending downwardly and inwardly inclined toward said lower wall. 
     
     
       8. A garbage incinerator as defined in claim 6, wherein said nozzle box means has a trapezoidal cross-section and an upper wall substantially normal to the wall of the flue and an inner wall extending downwardly and inwardly inclined from an inner edge of said upper wall, the first plurality of nozzles being provided in said upper wall oriented to direct air streams at high speed in upward direction and substantially parallel to the wall of the flue and the second plurality of nozzles being provided in said inner wall oriented to direct air streams at high speed in a direction substantially normal to said inner wall into said stream of flue gas. 
     
     
       9. A garbage incinerator as defined in claim 5, wherein said nozzle box means has a trapezoidal cross-section and an upper wall substantially normal to the wall of said flue and an inner wall extending downwardly and outwardly inclined from an inner edge of said upper wall, the first plurality of nozzles being provided in said upper wall oriented to direct air streams at high speed in upward direction and substantially parallel to the wall of the flue and the second plurality of nozzles being provided in said inner wall oriented to direct air streams at high speed in a direction substantially normal to said inner wall into said stream of flue gas. 
     
     
       10. A garbage incinerator as defined in claim 6, wherein said nozzle box means has a rectangular cross-section having a top wall and a bottom wall substantially normal to the wall of the flue and an inner wall, the first and the second plurality of nozzles being respectively provided in said top and said bottom wall oriented to direct air streams at high speed respectively in upward and downward directions substantially parallel to said flue, and a third plurality of nozzles being provided in said inner wall oriented to direct air streams at high speed in a direction substantially normal to said inner wall into said stream of flue gas. 
     
     
       11. A garbage incinerator as defined in claim 1, wherein two nozzle box means are arranged in said transition zone opposite each other, each of said nozzle box means having a triangular cross-section with one wall abutting against a wall of the flue, and a first and a second plurality of nozzles being provided in other walls of the nozzle box means and oriented to direct air streams at high speed respectively normal to the other walls into the stream of flue gas. 
     
     
       12. A garbage incinerator as defined in claim 1, wherein said nozzle box means comprise at least one hollow body of heat- and pressure-resistant material. 
     
     
       13. A garbage incinerator, comprising a combustion grate; inlet passage means for feeding garbage onto said combustion grate; wall means forming a combustion chamber above said grate; an upwardly projecting flue connected to said combustion chamber so that a stream of flue gases passes from said combustion chamber through said flue; nozzle means for blowing secondary air streams at high speed into said stream of flue gas, said wall means further including a transition zone between said combustion chamber and said flue, said nozzle means being positioned within said wall means and in said transition zone, said nozzle means being provided with blower means for supplying secondary air into said nozzle box means, said nozzle means including at least one elongated hollow box-shaped member having an axis of elongation extending horizontally, said member projecting over the entire width of said combustion chamber and including a plurality of nozzles distributed over the entire length thereof and being closely arranged relative to each other, at least some of said nozzles having axes being oriented to direct air streams at high speed, in a direction transverse to the stream of flue gases. 
     
     
       14. The incinerator as defined in claim 13, wherein said member includes at least one side formed with said nozzles, said nozzles being arranged on said side in two rows, the nozzles in said two rows being offset relative to each other so that the distance between adjacent nozzles in each row is at most equal to the diameter of each nozzle. 
     
     
       15. The incinerator as defined in claim 13, wherein said member has a first plurality of nozzles oriented to direct air streams at high speed in a direction transverse to the stream of flue gas and a second plurality of nozzles oriented to direct air streams at high speed in a direction substantially parallel to the wall means forming said flue. 
     
     
       16. The incinerator as defined in claim 13, wherein said wall means form at the transition zone between said combustion chamber and said flue at least one nose-like protrusion having an upwardly inclined face, and wherein said nozzle means is arranged adjacent to said protrusion, said member having a first plurality of nozzles oriented to direct air streams at high speed in upward direction along said upwardly inclined face and a second plurality of nozzles oriented to direct air streams at high speed in a direction transverse to said first mentioned streams into said stream of flue gas. 
     
     
       17. The incinerator as defined in claim 13, wherein said wall means form at the transition zone between said combustion chamber and said flue a nose-like protrusion having an upwardly inclined face, and wherein said nozzle means is arranged above and adjacent to said inclined face, said member having a first plurality of nozzles oriented to blow air streams at high speed in downward direction substantially parallel to said inclined face and a second plurality of nozzles oriented to blow air streams at high speed in a direction transverse to said first-mentioned air streams into said stream of flue gas. 
     
     
       18. The incinerator as defined in claim 13, wherein member is annular and is positioned substantially in a plane normal to said upwardly extending flue, said member having a first plurality of nozzles oriented for directing air streams at high speed substantially parallel to the upwardly extending wall of said flue and a second plurality of nozzles oriented to direct air streams at high speed transverse to the first-mentioned air streams into said stream of flue gas. 
     
     
       19. The incinerator as defined in claim 18, wherein said member has a trapezoidal cross-section and a lower wall substantially normal to said flue and an inner wall extending downwardly and inwardly inclined toward said lower wall. 
     
     
       20. A garbage incinerator as defined in claim 18, wherein member has a trapezoidal cross-section and an upper wall substantially normal to a wall of the flue and an inner wall extending downwardly and inwardly inclined from an inner edge of said upper wall, the first plurality of nozzles being provided in said upper wall and being oriented to direct air streams at high speed in upward direction and substantially parallel to the wall of the flue and the second plurality of nozzles being provided in said inner wall and being oriented to direct air streams at high speed in a direction substantially normal to said inner wall into said stream of flue gas. 
     
     
       21. The incinerator as defined in claim 17, wherein said member has a trapezoidal cross-section and an upper wall substantially normal to a wall of said flue and an inner wall extending downwardly and outwardly inclined from an inner edge of said upper wall, the first plurality of nozzles being provided in said upper wall and being oriented to direct air streams at high speed in upward direction and substantially parallel to the wall of the flue, and the second plurality of nozzles being provided in said inner wall and being oriented to direct air streams at high speed in a direction substantially normal to said inner wall into said stream of flue gas. 
     
     
       22. A garbage incinerator as defined in claim 18, wherein said member has a rectangular cross-section having a top wall and a bottom wall substantially normal to a wall of the flue and an inner wall, the first and the second plurality of nozzles being respectively provided in said top and said bottom wall and being oriented to direct air streams at high speed respectively in upward and downward directions substantially parallel to said flue, and a third plurality of nozzles being provided in said inner wall and being oriented to direct air streams at high speed in a direction substantially normal to said inner wall into said stream of flue gas. 
     
     
       23. A garbage incinerator as defined in claim 13, wherein two such box-shaped members are arranged in said transition zone opposite each other, each of said members having a triangular cross-section with one wall abutting against a wall of the flue, and a first and a second plurality of nozzles being provided in other walls of the nozzle box means and being oriented to direct air streams at high speed respectively normal to the other walls into the stream of flue gas. 
     
     
       24. A garbage incinerator as defined in claim 13, wherein said member is made of heat- and pressure-resistant material.